Actually, I see this overused, but it really means a person's having their personal myopia challenged, and they don't like the way others actually work. Most people believe that people are people, and are taught that everyone's created equal - and thus, they imagine that everyone should be inherently like them.Colour Scientist said:In a similar vein to yours, '... makes me lose faith in humanity' will always induce eye-rolling for me.
It's dramatic and it's always used in relation to shitty things, like something that happened in a television show or some terrible/embarrassing thing done by one individual.
I think the reason that it really bugs me is because it implies a kind of smug sense of superiority, as if the person saying it is above the foibles of humanity and it just a disappointed observer.
It's largely caused by people finding most people don't actually live up to the moral standards they've been brought up with, even after trying to see the situation from the other point of view. Loss of faith in humanity is when you realize you're in the minority (Or the offensive action is widespread)
"Holy shit, there actually are Christians/Muslims that preach hatred, murder, and intolerance and celebrate military prowess? And believe that the religious texts can be read without understanding the context in which they were written, and audience they were written for? And why the hell is my own faith protecting pedophiles?"
"Holy shit, there actually are guys who feel they are entitled to a female's body?"
"What sort of person would walk out on his job after bugging me for weeks about trying to get the position just because his girlfriend came around - right in the middle of training!?"
"Wait... who the hell thinks it's acceptable to take company property for personal use without at least clearing it with the manager first?"
The one that pisses me off is "There's no logical reason for person to do X" - people are not logical, rational creatures.